Archive for the ‘Math’ Category

Make a Sugihara Circle/Square Optical Illusion Out of Paper

Posted by: Dave Richeson on July 6, 2016

Sugihara’s Circle/Square Optical Illusion

Posted by: Dave Richeson on July 5, 2016

Measuring Tapes for Circles and Spheres

Posted by: Dave Richeson on April 21, 2016

Zip-Apart Möbius Bands

Posted by: Dave Richeson on April 11, 2016

A Trig-free Proof of Crockett Johnson’s Theorem

Posted by: Dave Richeson on April 7, 2016

A Geometry Theorem Looking for a Geometric Proof

Posted by: Dave Richeson on March 23, 2016

A Trisectrix from a Carpenter’s Square

Posted by: Dave Richeson on March 11, 2016

Good activity for an Introduction to Proofs class

Posted by: Dave Richeson on February 25, 2016

Editing a Very Poorly Written Proof

Posted by: Dave Richeson on October 10, 2015

Tangent lines to the sine function with rational slope

Posted by: Dave Richeson on August 27, 2014

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